The horn on a motor scooter emit sound waves with a frequency of 440 Hz. The driver blows the horn as the scooter moves towards you at a speed of 12.5 m/s. What is the frequency of the sound you hear? Assume the temperature is 20°C.
Knowns Unknown

v = vd = fd = ?

vs = fs =

Solve for the Unknown  Use fd = fs[(v-vd)/(v-vs)] with vd = 0 m/s

Evaluate the Answer

Are the units correct?

Is the magnitude realistic?

Answer form flower;

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction